US20210367455A1 - Electromagnetic field transceiver device and wireless charging device - Google Patents

Electromagnetic field transceiver device and wireless charging device Download PDF

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Publication number
US20210367455A1
US20210367455A1 US17/322,473 US202117322473A US2021367455A1 US 20210367455 A1 US20210367455 A1 US 20210367455A1 US 202117322473 A US202117322473 A US 202117322473A US 2021367455 A1 US2021367455 A1 US 2021367455A1
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United States
Prior art keywords
metal conductor
selective shielding
electromagnetic field
sealing ring
cover
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Pending
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US17/322,473
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English (en)
Inventor
Jianhong Zeng
Benze Zou
Tao Ye
Lei Zhang
Shun Zhang
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Delta Electronics Shanghai Co Ltd
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Delta Electronics Shanghai Co Ltd
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Assigned to DELTA ELECTRONICS (SHANGHAI) CO., LTD. reassignment DELTA ELECTRONICS (SHANGHAI) CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZHANG, LEI, YE, TAO, ZENG, JIANHONG, ZHANG, Shun, ZOU, BENZE
Publication of US20210367455A1 publication Critical patent/US20210367455A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/025—Constructional details relating to cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/03—Covers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/06—Hermetically-sealed casings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/06—Hermetically-sealed casings
    • H05K5/069—Other details of the casing, e.g. wall structure, passage for a connector, a cable, a shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields

Definitions

  • the present disclosure relates to the field of wireless charging technology, and particularly to an electromagnetic field transceiver device and a wireless charging device.
  • a high-power electromagnetic radiation not only interferes with other electronic devices around, but also harms human beings, animals and plants, thus the electromagnetic shielding of the electronic products in the design process thereof is particularly important.
  • a metal shell is commonly used for electromagnetic shielding, which uses the metal electromagnetic shielding to form an electromagnetically closed cavity, and the electric and magnetic fields inside the cavity cannot penetrate the metal shell.
  • the wireless charging device needs to use a magnetic field to transmit energy to a device that needs to be charged. Therefore, a part of region in the wireless charging device is required to allow partial magnetic fields to pass through, but cannot exceed a relevant electromagnetic shielding standard.
  • a shielding layer only shields the electric field emitted by the coil, accordingly the protection against the magnetic field is limited.
  • a selective shielding cover provided with an electromagnetic field transceiver window which selectively shields an electric field and/or a magnetic field;
  • the selective shielding cover being seamlessly connected to an opening of the cover body relative to the electric field or the magnetic field through the sealing ring, the selective shielding cover and the cover body forming a cavity, the sealing ring being electrically connected to the selective shielding cover, and the sealing ring enclosing the electromagnetic field transceiver window;
  • a transceiver unit provided in the cavity and configured to receive or transmit a target electric field and/or the magnetic field.
  • a wireless charging device includes: the electromagnetic field transceiver device of any one of the above embodiments, the selective shielding cover is connected to the opening of the cover body in a sealing manner; and
  • a driving circuit provided in the cavity and electrically connected to the transceiver unit, and configured to drive the transceiver unit to receive or transmit the target electric field and/or the magnetic field through the electromagnetic field transceiver window.
  • the selective shielding cover in the present disclosure is seamlessly connected to an opening of the cover body relative to the electric field or the magnetic field through the sealing ring, and forms a closed cavity capable of shielding the electromagnetic interference other than from the target electromagnetic field.
  • the selective shielding cover is provided with the electromagnetic field transceiver window, and the transceiver unit is provided in the cavity, so that the transceiver unit can receive or transmit the target electromagnetic field through the electromagnetic field transceiver window.
  • FIG. 1 is a structure block diagram of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view I of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 3 is a structure block diagram of an electromagnetic field transceiver device according to another embodiment of the present disclosure.
  • FIG. 4 is a cross-sectional view of an electromagnetic field transceiver device according to another embodiment of the present disclosure.
  • FIG. 5 is an enlarged view of a portion A in FIG. 4 .
  • FIG. 6 is a cross-sectional view II of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structure diagram I of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structure diagram II of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structure diagram III of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structure diagram IV of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structure diagram V of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structure diagram VI of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structure diagram VII of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic structure diagram VIII of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structure diagram IX of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic structure diagram X of an electromagnetic field transceiver device according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic structure diagram I of a first metal conductor and a second metal conductor according to an embodiment of the present disclosure.
  • FIG. 18 is a schematic structure diagram II of a first metal conductor and a second metal conductor according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic structure diagram III of a first metal conductor and a second metal conductor according to an embodiment of the present disclosure.
  • FIG. 20 is a schematic structure diagram I of a wireless charging device according to an embodiment of the present disclosure.
  • FIG. 21 is a schematic diagram of a conventional wireless charging common-mode noise circuit according to an embodiment of the present disclosure.
  • FIG. 22 is a schematic diagram I of a wireless charging common-mode noise circuit according to an embodiment of the present disclosure.
  • FIG. 23 is a schematic diagram II of a wireless charging common-mode noise circuit according to an embodiment of the present disclosure.
  • FIG. 24 is a schematic structure diagram II of a wireless charging device according to an embodiment of the present disclosure.
  • FIG. 25 is a schematic structure diagram of an additional shielding layer according to an embodiment of the present disclosure.
  • FIG. 26 is a schematic structure diagram III of a wireless charging device according to an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides an electromagnetic field transceiver device 10 , including a cover body 100 , a selective shielding cover 200 , a sealing ring 300 and a transceiver unit 400 .
  • the selective shielding cover 200 is provided with an electromagnetic field transceiver window 210 that selectively shields an electric field and/or a magnetic field.
  • the selective shielding cover 200 is seamlessly connected to an opening of the cover body 100 relative to the electric field and/or the magnetic field through the sealing ring 300 ; and the selective shielding cover 200 and the cover body 100 form a cavity 201 .
  • the sealing ring 300 is electrically connected to the selective shielding cover 200 , and the sealing ring 300 encloses the electromagnetic field transceiver window 210 .
  • the transceiver unit 400 is provided in the cavity 201 .
  • the transceiver unit 400 is configured to receive or transmit a target electromagnetic field.
  • a material of the cover body 100 is not limited, as long as the cover body 100 and the selective shielding cover 200 can form the cavity 201 through the sealing ring 300 .
  • the material of the cover body 100 can be a non-shielding material, such as plastic.
  • the material of the cover body 100 can also be a shielding material, such as aluminum, copper, iron, and the like metal material.
  • the selective shielding cover 200 can be a Printed Circuit Board (PCB) board including a shielding layer.
  • the selective shielding cover 200 is provided with an electromagnetic field transceiver window 210 which selectively shields an electric field and/or a magnetic field.
  • a size of the electromagnetic field transceiver window 210 is not limited, as long as that the sealing ring 300 can enclose the electromagnetic field transceiver window 210 .
  • that the selective shielding cover 200 is seamlessly connected to the opening of the cover body 100 relative to the electric field and/or the magnetic field through the sealing ring 300 refers to: a seamless connection with respect to the electric field and/or magnetic field is formed between the sealing ring 300 and the selective shielding cover 200 , while a seamless connection with respect to the electric field and/or magnetic field is formed between the sealing ring 300 and the opening of the cover body 100 .
  • the step of forming the seamless connection with respect to the electric field and/or magnetic field refers to: a gap between the sealing ring 300 and the opening of the cover body 100 , and a gap between the sealing ring 300 and the selective shielding cover 200 are small enough that an electric field and/or a magnetic field of a frequency band that needs to be shielded by the electromagnetic field transceiver device 10 cannot pass through obviously.
  • the sealing ring 300 is seamlessly connected to the opening of the cover body 100 and the selective shielding cover 200 to implement the shielding function.
  • the sealing ring 300 and the selective shielding cover 200 can be formed in one piece.
  • the implementation method of the seamless connection between the sealing ring 300 and the opening of the cover body 100 is not limited, as long as that the selective shielding cover 200 and the cover body 100 can form a cavity 201 by using the sealing ring 300 .
  • the sealing ring 300 sleeves the cover body 100 .
  • the sealing ring 300 is coaxially arranged with the cover body 100 , and the sealing ring 300 is seamlessly connected to a side wall of the cover body 100 away from the transceiver unit 400 .
  • the sealing ring 300 can be arranged to directly attach to the side wall of the cover body 100 .
  • the cover body 100 includes at least one side edge forming the opening, and one end of the at least one side edge connected to the sealing ring 300 includes at least one groove. That is, the sealing ring 300 can also be provided in the groove, and matched with the selective shielding cover 200 and the cover body 100 to form the cavity 201 capable of shielding an electromagnetic interference other than from the target electromagnetic field.
  • the transceiver unit 400 By providing the transceiver unit 400 in the cavity 201 , a smooth transmission function of the target electromagnetic field can be implemented, and an excellent effect of shielding the electromagnetic interference is achieved.
  • the sealing ring 300 can also be provided at an edge of the opening of the cover body 100 . Further, the sealing ring 300 can be directly attached to the side wall of the cover body 100 . At the same time, the selective shielding cover 200 can be seamlessly connected to the opening of the cover body 100 relative to the electric field or magnetic field through the sealing ring 300 .
  • the cover body 100 includes at least one side edge forming the opening, and one end of the opening formed by the at least one side edge connected to the sealing ring 300 includes at least one groove. As shown in FIG. 5 , a sidestep high outside and low inside (i.e.
  • a groove is reserved at the edge of the opening of the cover body 100 ; and the sealing ring 300 and the selective shielding cover 200 are sequentially arranged in the groove, and matched with the cover body 100 to form the cavity 201 , so that the electric field and/or the magnetic field inside the cavity can be selected shielded inside the cavity.
  • the specific structure of the sealing ring 300 is not limited, as long as that the selective shielding cover 200 is seamlessly connected to the opening of the cover body 100 relative to the electric field or the magnetic field through the sealing ring 300 .
  • the structure of the sealing ring 300 can be a mesh structure. By using an electrical convergence area formed by the sealing ring with the mesh structure, not only the sealing effect of the electromagnetic field is guaranteed, but also a stress caused by the full-covering metal layer is reduced.
  • the structure of the sealing ring 300 may also be a full-covering structure.
  • the gap between the sealing ring 300 and the cover body 100 can be reduced, and then the penetration of the electromagnetic interference is avoided.
  • the specific structure of the transceiver unit 400 is not limited, as long as the transceiver unit 400 has the function of receiving or transmitting the target electric field and/or the magnetic field through the electromagnetic field transceiver window 210 .
  • the transceiver unit 400 may consist of a coil winding and a substrate.
  • an area of the electromagnetic field transceiver window 210 of the transceiver unit 400 is smaller than and placed in an area enclosed by the sealing ring 300 , so as to prevent the target electric field and/or the target magnetic field from radiating to the sealing ring 300 and other shielding materials and causing an excessive loss and a signal attenuation.
  • the selective shielding cover 200 is seamlessly connected to the opening of the cover body 100 relative to the electric field or magnetic field through the sealing ring 300 , and forms the cavity capable of shielding the electromagnetic interference other than from the target electromagnetic field 201 .
  • the selective shielding cover 200 is provided with the electromagnetic field transceiver window 210 , and the transceiver unit 400 is provided in the cavity 201 , so that the transceiver unit 400 can implement the receiving or transmitting function of the target electric field and/or the target magnetic field in the electromagnetic field transceiver window 210 .
  • a conducting layer 301 is provided between the sealing ring 300 and the cover body 100 . That is, the conducting layer 301 is added between the sealing ring 300 and the cover body 100 , which can make the shielding effect better.
  • the conducting layer 301 can use a flexible conducting material, such as conductive glue.
  • the selective shielding cover 200 is provided with a selective shielding region.
  • the selective shielding region includes at least one metal conductor. One end of each metal conductor is electrically connected to one side of the sealing ring 300 .
  • a shielding pattern formed by the at least one metal conductor in the selective shielding region is not limited, as long as the shielding pattern can implement the shielding function.
  • the electromagnetic field transceiver window 210 is provided in the selective shielding region, that is, an area of the electromagnetic field transceiver window 210 is smaller than an area of the selective shielding region.
  • each metal conductor is electrically connected to one side of the sealing ring 300 refers to: one end of each metal conductor is electrically connected to the sealing ring 300 , and the other end of each metal conductor is suspended.
  • one end of each metal conductor can be electrically connected to one side of the sealing ring 300 .
  • the sealing ring 300 includes: at least two sealing conductive units 310 .
  • the at least two sealing conductive units 310 are arranged at intervals, and each of the sealing conductive units 310 is electrically connected to the opening of the cover body 100 .
  • the sealing conductive unit 310 can be electrically connected to the edge of the opening of the cover body 100 through a conductive junction 302 .
  • the conductive junction 302 can be made of a flexible conductive material, such as conductive glue, etc.
  • the conductive junction 302 is grounded, which can achieve overall equipotential.
  • the sealing ring 300 includes a first connecting portion 320 and a second connecting portion 330 which are central symmetric.
  • the selective shielding cover 200 is provided with a selective shielding region.
  • At least one first metal conductor 221 and at least one second metal conductor 222 are further provided on one surface of the selective shielding region.
  • a first end of each first metal conductor 221 is electrically connected to the first connecting portion 320 .
  • a second end of each second metal conductor 222 is electrically connected to the second connecting portion 330 .
  • the at least one first metal conductor 221 and the at least one second metal conductor 222 are alternately arranged at intervals.
  • At least one first metal conductor 221 and at least one second metal conductor 222 are further provided on one surface of the selective shielding region refers to: at least one first metal conductor 221 and at least one said second metal conductor 222 can be provided on any surface of the selective shielding region.
  • the first metal conductor 221 and the second metal conductor 222 are both multiple, the first metal conductors 221 and the second metal conductors 222 can be alternately arranged at intervals.
  • a first end of each of the first metal conductors 221 is electrically connected to the first connecting portion 320 , and a second end of each of the first metal conductors 221 is suspended.
  • a second end of each of the second metal conductors 222 is electrically connected to the second connecting portion 330 , and a first end of each of the second metal conductors 222 is suspended.
  • the first metal conductor 221 and the second metal conductor 222 can be metal conductors, such as iron, aluminum, copper, and the like.
  • a selective shielding coating 240 can be coated on one surface of the selective shielding cover 200 , and the selective shielding coating 240 covers the electromagnetic field transceiver window 210 .
  • the selective shielding coating 240 has good magnetic permeability (that is, which can shield the magnetic field) while the electrical conductivity is not good (that is, which can pass through the magnetic field the electric field). In other words, the selective shielding coating 240 can eliminate the magnetic field penetration, and realize the effects that the electric field merely shielded and the magnetic field is almost shielded.
  • a grounding network consisting of at least one first metal conductor 221 and at least one second metal conductor 222 can be added to the selective shielding coating 240 , and is utilized to set the electric potential, so as to reduce the impedance.
  • the total area of an orthographic projection of the grounding network on the selective shielding cover 200 needs to be less than one-tenth of the area of the electromagnetic field transceiver window 210 . That is, a width of each metal conductor needs to be less than one-tenth of a width between adjacent metal conductors.
  • the sealing ring 300 includes a first connecting portion 320 and a second connecting portion 330 which are central symmetric.
  • the selective shielding cover 200 is provided with a selective shielding region.
  • At least one first metal conductor 221 , at least one second metal conductor 222 , and at least one metal ring 230 arranged in an array are provided on one surface of the selective shielding region, and at least one metal ring 230 in each column is electrically connected to one first metal conductor 221 or one second metal conductor 222 .
  • a first end of each of the first metal conductors 221 is electrically connected to the first connecting portion 320 .
  • a second end of each of the second metal conductors 222 is electrically connected to the second connecting portion 330 , and the at least one first metal conductor 221 and the at least one second metal conductor 222 are alternately arranged at intervals.
  • a material of the metal ring 230 can be copper.
  • the at least one metal ring 230 arranged in an array shields the magnetic field, accordingly the magnetic field penetration can be eliminated.
  • partial electric field can be shielded while the magnetic field is selectively shielded.
  • a total area of the orthographic projections of the at least one metal ring 230 , the at least one first metal conductor 221 and the at least one second metal conductor 222 on the selective shielding cover 200 needs to be less than one-tenth of an area of the electromagnetic field transceiver window 210 .
  • the sealing ring 300 includes a first connecting portion 320 and a second connecting portion 330 which are central symmetric.
  • the selective shielding cover 200 is provided with a selective shielding region.
  • At least one first metal conductor 221 and at least one second metal conductor 222 are further provided on one surface of the selective shielding region.
  • a first end of each first metal conductor 221 is electrically connected to the first connecting portion 320 .
  • a second end of each second metal conductor 222 is electrically connected to the second connecting portion 330 .
  • the at least one first metal conductor 221 and the at least one second metal conductor 222 are alternately arranged at intervals.
  • the widths of the first metal conductor 221 and the second metal conductor 222 are between a skin depth of one target electromagnetic field and a skin depth of three target electromagnetic fields, and preferably between a skin depth of two target electromagnetic fields and a skin depth of three target electromagnetic fields.
  • the use of such a width for each metal conductor can hardly lose the frequency band of the target magnetic field, and can further significantly attenuate the high-frequency magnetic field, thereby achieving the effects that the magnetic field is selectively passed through and the electric field is shielded.
  • a width between the metal conductors can be determined according to actual economy and process, but the smaller the width, the better, so as to obtain the largest possible shielding region.
  • each of the first metal conductors 221 is grounded through the first connecting portion 320 ; each of the second metal conductors 222 is grounded through the second connecting portion 330 .
  • Each first metal conductor and each second metal conductor are spaced and respectively grounded at two sides through the first connecting portion 320 and the second connecting portion 330 , accordingly the collection and grounding impedance is reduced.
  • the selective shielding cover 200 is provided with a selective shielding region. At least one first metal conductor 221 or second metal conductor 222 is provided at intervals on one surface of the selective shielding region. At least one spacing region 223 is provided in the selective shielding pattern formed by the at least one first metal conductor 221 or second metal conductor 222 . One end of each of the first metal conductors 221 or the second metal conductors 222 is electrically connected to the sealing ring 300 . The other end of each of the first metal conductors 221 or the second metal conductors 222 is suspended in the spacing region 223 . In an embodiment, a shape of the spacing region 223 is a straight line, a curved line or a broken line.
  • a length of each metal conductor in FIG. 11 is approximately equal to half the width of the cover body 100 , meanwhile the metal conductors are grounded on the opposite two sides of the sealing ring 300 in parallel, so that nearly half the grounding impedance of each metal conductor is reduced on the basis of FIG. 10 .
  • the length of each metal conductor in FIG. 12 is approximately equal to half the width of the cover body 100 , meanwhile each metal conductor is grounded on respective four sides of the sealing ring 300 in parallel, so that the collection and grounding impedance of the metal conductor is further reduced on the basis of FIG. 11 .
  • a diagonal passing through the center point of the selective shielding cover 200 is taken as spacing regions 223 , so that the longest length of the metal conductors is approximately equal to half the length of the selective shielding cover 200 , meanwhile the lengths of the other metal conductors are gradually reduced relative to the longest length of the metal conductors, so that the overall grounding impedance is lower.
  • the spacing region 223 of the metal conductors is arranged in a curved line or a broken line, so as to prevent a long-length parting line from leaking the target electric field and/or the target magnetic.
  • a third metal conductor 224 is further provided on a surface of the selective shielding region.
  • One end of each third metal conductor 224 is electrically connected to the first metal conductor 221 or the second metal conductor 222 .
  • a material of the third metal conductor 224 is the same as that of the first metal conductor 221 or the second metal conductor 222 .
  • the selective shielding cover 200 is provided with a selective shielding region.
  • At least one fourth metal conductor 225 which is non-closed and curled is provided at intervals on a surface of the selective shielding region.
  • One end of each fourth metal conductor 225 is electrically connected to the sealing ring 300 , and/or one end of each fourth metal conductor 225 is electrically connected to the sealing ring 300 through another fourth metal conductor 225 .
  • a material of the fourth metal conductor 225 is the same as that of the first metal conductor 221 .
  • the sealing ring 300 includes a first connecting portion 320 and a second connecting portion 330 which are central symmetric.
  • the selective shielding cover 200 is provided with a selective shielding region. At least one first metal conductor 221 and at least one second metal conductor 222 are provided on one surface of the selective shielding region. The first metal conductor 221 and the second metal conductor 222 are at least partially fitted with each other. As shown in FIGS. 17 to 19 , the first metal conductor 221 and the second metal conductor 222 having a shape of a coordinate axis type ( FIG. 17 ), an S type ( FIG. 18 ) or a digital type ( FIG.
  • a wireless charging device 20 which includes the electromagnetic field transceiver device 10 described in any of the above embodiments and a driving circuit 500 .
  • the selective shielding cover 200 and the sealing ring 300 are seamlessly connected to the opening of the cover body 100 .
  • the driving circuit 500 is provided in the cavity 201 .
  • the driving circuit 500 is electrically connected to the transceiver unit 400 .
  • the driving circuit 500 is configured to drive the transceiver unit 400 to receive or transmit the target electric field and/or the magnetic field through the electromagnetic field transceiver window 210 .
  • the wireless charging device 20 can be applied to charge an intelligent electronic device.
  • the intelligent electronic device can be a mobile phone or a smart watch with a wireless charging function.
  • the sealing manner in which the selective shielding cover 200 and the sealing ring 300 are connected to the opening of the cover body 100 is not limited, as long as the sealing between the selective shielding cover 200 as well as the sealing ring 300 and the opening of the cover body 100 is guaranteed.
  • the selective shielding cover 200 and the sealing ring 300 can be sealed with the opening of the cover body 100 by a sealant.
  • the selective shielding cover 200 and the sealing ring 300 can also be sealed with the opening of the cover body 100 by a rubber ring.
  • a specific circuit structure of the driving circuit 500 is not limited, as long as it has the function of driving the transceiver unit 400 to receive or transmit the target electric field and/or the magnetic field through the electromagnetic field transceiver window 210 .
  • the driving circuit 500 can be a conventional driving chip having a function of driving the transceiver unit 400 to receive or transmit the target electromagnetic field.
  • the transceiver unit 400 includes a substrate 410 and a coil winding 420 .
  • the substrate 410 is fixed in the cavity 201 .
  • the coil winding 420 is fixed on a side of the substrate 410 facing the selective shielding cover 200 .
  • the coil winding 420 is electrically connected to the driving circuit 500 .
  • the coil winding 420 is configured to receive or transmit the target electric field and/or the magnetic field through the electromagnetic field transceiver window 210 .
  • the substrate 410 can be a magnetic substrate.
  • the coil winding 420 can be attached with the selective shielding cover 200 , so as to reduce an outward transmission distance as much as possible, thereby improving the wireless charging efficiency for the intelligent electronic device.
  • the coil winding 420 can be fitted with the electromagnetic field transceiver window 210 , so that the outward transmission distance of the coil winding 420 is reduced as much as possible.
  • the coil winding 420 can consist of a plurality of coils.
  • the selective shielding cover 200 is provided with a selective shielding region.
  • the selective shielding region covers an orthographic projection of the coil winding 420 on the selective shielding cover 200 .
  • a shielding pattern of the selective shielding region can be the pattern described in the above described embodiments, which will not be repeated here.
  • FIG. 21 which is a conventional wireless charging common-mode noise model
  • a voltage jump of the transmitting coil i.e., the coil winding 420
  • Cps the transmitting coil
  • L 1 the transmitting coil
  • L 2 the common-mode inductance L 2 between the wireless charging device input terminal and an internal converter power ground. Accordingly, the common-mode noise can be obtained by measuring the current on L 1 .
  • Vcoil can form a larger common-mode current i 1 through Cps.
  • the wireless charging device 20 adds a partition in the Cps while sealing part of the magnetic field, so that the Cps is divided into two parts.
  • One part of the Cps becomes the capacitance between the coil winding 420 and the selective shielding cover 200
  • the other part of the Cps is the capacitance of the selective shielding cover 200 relative to the vehicle body.
  • FIG. 22 it can be seen that most of the common-mode energy of Vcoil is consumed by a cycle of a current i 2 inside the shielding loop formed by the selective shielding cover 200 and the cover body 100 .
  • the common-mode current i 1 flowing through L 1 is greatly reduced in the solution shown in FIG. 22 .
  • an additional shielding layer 250 is provided between the selective shielding cover 200 and the coil winding 420 .
  • an additional shielding layer 250 is provided on a surface of a side of the selective shielding cover 200 facing the cover body 100 , and at least part of an orthographic projection of the additional shielding layer 250 on the substrate 410 coincides with the orthographic projection of the coil winding 420 on the substrate 410 .
  • the additional shielding layer 250 is added between the selective shielding cover 200 and the coil winding 420 , and the additional shielding layer 250 is directly connected to the power ground. In such a way, most of the common-mode current can be consumed by a cycle of a current i 3 inside the wireless charging device 20 , so that the common-mode current flowing through the L 1 can be minimized.
  • the additional shielding layer 250 can have a multi-layer structure. At the same time, a surface of the additional shielding layer 250 can have the shielding pattern in the selective shielding region described in the above embodiments.
  • the additional shielding layer 250 can further be provided with a near-field communication line and/or a thermistor temperature sampling line 251 .
  • the near-field communication line can be an NFC coil
  • the thermistor temperature sampling line can be an NFC temperature sampling coil.
  • the near-field communication line and/or the thermistor temperature sampling line 251 integration in the additional shielding layer 250 should not form a loop as far as possible; and at the same time, these lines are electric connected to the power ground, thereby achieving the shielding of the electric field of the additional shielding layer 250 .
  • the near-field communication line and/or the thermistor temperature sampling line 251 when they are electric connected to grounded, if they conflict with other lines, they can be crossed via holes. The near-field communication line and/or the thermistor temperature sampling line 251 are integration in the additional shielding layer 250 , accordingly the cost can be saved.
  • the wireless charging device 20 further includes a heat conducting support plate 600 .
  • the heat conducting support plate 600 is provided in the cavity 201 .
  • the heat conducting support plate 600 is fixedly connected to the cover body 100 .
  • the heat conducting support plate 600 is attached to a side of the substrate 410 away from the coil winding 420 .
  • the heat conducting support plate 600 and the cover body 100 can be formed in one piece.
  • the heat conducting support plate 600 can be pasted to the side of the substrate 410 away from the coil winding 420 by glue.
  • the heat in the cavity 201 and the heat generated by the coil winding 420 when receiving or transmitting the target electric field and/or the magnetic field are directed conducted to the cover body 100 through the heat conducting support plate 600 , so as to dissipate the heat through heat dissipation fins provided on the cover body 100 .
  • the wireless charging device 20 further includes a cover plate 700 .
  • the cover plate 700 is connected to the opening of the cover body 100 in a sealing manner.
  • the cover plate 700 is attached to a side of the selective shielding cover 200 away from the transceiver unit 400 .
  • the cover plate 700 can be made of a non-conductive material, such as a plastic.
  • the cover plate 700 can be sealed with the opening of the cover body 100 by a sealant to achieve waterproof and dustproof effects.
  • the selective shielding cover 200 in the present disclosure is seamlessly connected to the opening of the cover body 100 relative to the electric field or the magnetic field through the sealing ring 300 , and forms a closed cavity 201 capable of shielding an electromagnetic interference other than the target electric field and/or the magnetic field.
  • the selective shielding cover 200 is provided with the electromagnetic field transceiver window 210 , and the transceiver unit 400 is provided in the cavity 201 , so that the transceiver unit 400 can receive or transmit the target electric field and/or the magnetic field through the electromagnetic field transceiver window 210 .
  • the present disclosure can not only realize the smooth transmission function of the target electric field and/or the magnetic field, but also has an excellent effect of shielding the electromagnetic interference, and has a strong adaptability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Telephone Set Structure (AREA)
US17/322,473 2020-05-22 2021-05-17 Electromagnetic field transceiver device and wireless charging device Pending US20210367455A1 (en)

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CN202010441941.4 2020-05-22
CN202010441941.4A CN111669926B (zh) 2020-05-22 2020-05-22 电磁场收发装置及无线充电装置

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